how they're owners are turning to alternative ways to cure >>> from new york city, this is "nightline" with terry moran. >> hello, i'm terry moran. tonight, a manhunt is under way in southern california and the los angeles police department is under siege. 10,000 law enforcement officers are conducting door-to-door searches for one of their own, a fugitive ex-cop. 33-year-old christopher jordan dorner, suspected of killing three people in a terrifying rampage, after making claims in a bizarre online manifesto that he was unjustly fired by the lapd and needs to clear his name. in a police department with a storied and troubled history, they have never seen anything like this before. here's abc's david wright with the latest. >> attention all units, speed into reference 1199 for lapd. >> reporter: over the past 24 hours, a deadly manhunt across this whole region. >> suspect vehicle still outstanding, it's a black nissan titan. >> reporter: police officers hunting one of their own, a rogue former officer now accused of hunting them. >> of course he knows what he's doing. we trained him.